Answer:
Importance of Health Education
Health education programs help empower individuals and communities to live healthier lives by improving their physical, mental, emotional and social health by increasing their knowledge and influencing their attitudes about caring for their well-being
because of the "likely" in the question, I would say C (three years old)
but this question is very subjective. Children have their own progresses and can't be compared.....
Some are walking at 12 months, some at eighteen months, same for speaking !